基于天翔的老师的课程, 他的博客在这儿:
http://blog.csdn.net/johnmcu/article/details/6561311
注明不能转载, 就重新写一下吧:
1. 安装韦东山的虚拟版的ubuntu 9, 里面交叉编译啥的都弄好了, 直接用, 然后把workstation共享目录打开, 指向uboot的压缩包所在目录.
2. 在虚拟机上, 打开ssh, 通过ssh, 进/mnt/hgfs/ 把uboot压缩包解压了.
3. 编辑Makefile, 在smdk2400下面增加两行, 注意要好tab键
smdk2400_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t smdk2400 NULL s3c24x0
tx2440_config : unconfig
@$(MKCONFIG) $(@:_config=) arm arm920t tx2440 NULL s3c24x0
修改交叉编译命令如红色部分:
ifeq ($(ARCH),arm)
CROSS_COMPILE = arm-linux-
4. 把board目录下的除smdk2140目录其他全删了, 然后把smdk2140改名成tx2440
进去tx2440, 修改一下smdk2140.c改成tx2440.c
然后用vi, 修改board_init, 增加时钟的有关注释, 如下:
/* S3C2440: Mpll,Upll = (2*m * Fin) / (p * 2^s)
* m = M (the value for divider M)+ 8, p = P (the value for divider P) + 2
*/
#define S3C2440_MPLL_400MHZ ((0x7f<<12)|(0x02<<4)|(0x01))
#define S3C2440_UPLL_48MHZ ((0x38<<12)|(0x02<<4)|(0x02))
#define S3C2440_CLKDIV 0x05 /* FCLK:HCLK:PCLK = 1:4:8 */
/* S3C2410: Mpll,Upll = (m * Fin) / (p * 2^s)
* m = M (the value for divider M)+ 8, p = P (the value for divider P) + 2
*/
#define S3C2410_MPLL_200MHZ ((0x5c<<12)|(0x04<<4)|(0x00))
#define S3C2410_UPLL_48MHZ ((0x28<<12)|(0x01<<4)|(0x02))
#define S3C2410_CLKDIV 0x03 /* FCLK:HCLK:PCLK = 1:2:4 */
int board_init (void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
/* set up the I/O ports */
gpio->GPACON = 0x007FFFFF;
gpio->GPBCON = 0x00044555;
gpio->GPBUP = 0x000007FF;
gpio->GPCCON = 0xAAAAAAAA;
gpio->GPCUP = 0x0000FFFF;
gpio->GPDCON = 0xAAAAAAAA;
gpio->GPDUP = 0x0000FFFF;
gpio->GPECON = 0xAAAAAAAA;
gpio->GPEUP = 0x0000FFFF;
gpio->GPFCON = 0x000055AA;
gpio->GPFUP = 0x000000FF;
gpio->GPGCON = 0xFF95FFBA;
gpio->GPGUP = 0x0000FFFF;
gpio->GPHCON = 0x002AFAAA;
gpio->GPHUP = 0x000007FF;
/*support both of S3C2410 and S3C2440*/
if ((gpio->GSTATUS1 == 0x32410000) || (gpio->GSTATUS1 == 0x32410002))
{
/*FCLK:HCLK:PCLK = 1:2:4*/
clk_power->CLKDIVN = S3C2410_CLKDIV;
/* change to asynchronous bus mod */
__asm__( "mrc p15, 0, r1, c1, c0, 0/n" /* read ctrl register */
"orr r1, r1, #0xc0000000/n" /* Asynchronous */
"mcr p15, 0, r1, c1, c0, 0/n" /* write ctrl register */
:::"r1"
);
/* to reduce PLL lock time, adjust the LOCKTIME register */
clk_power->LOCKTIME = 0xFFFFFF;
/* configure MPLL */
clk_power->MPLLCON = S3C2410_MPLL_200MHZ;
/* some delay between MPLL and UPLL */
delay (4000);
/* configure UPLL */
clk_power->UPLLCON = S3C2410_UPLL_48MHZ;
/* some delay between MPLL and UPLL */
delay (8000);
/* arch number of SMDK2410-Board */
gd->bd->bi_arch_number = MACH_TYPE_SMDK2410;
}
else
{
/* FCLK:HCLK:PCLK = 1:4:8 */
clk_power->CLKDIVN = S3C2440_CLKDIV;
/* change to asynchronous bus mod */
__asm__( "mrc p15, 0, r1, c1, c0, 0/n" /* read ctrl register */
"orr r1, r1, #0xc0000000/n" /* Asynchronous */
"mcr p15, 0, r1, c1, c0, 0/n" /* write ctrl register */
:::"r1"
);
/* to reduce PLL lock time, adjust the LOCKTIME register */
clk_power->LOCKTIME = 0xFFFFFF;
/* configure MPLL */
clk_power->MPLLCON = S3C2440_MPLL_400MHZ;
/* some delay between MPLL and UPLL */
delay (4000);
/* configure UPLL */
clk_power->UPLLCON = S3C2440_UPLL_48MHZ;
/* some delay between MPLL and UPLL */
delay (8000);
/* arch number of SMDK2440-Board */
gd->bd->bi_arch_number = MACH_TYPE_S3C2440;
}
/* adress of boot parameters */
gd->bd->bi_boot_params = 0x30000100;
icache_enable();
dcache_enable();
return 0;
}
接着修改这个board/tx2440/下面的Makefile
把原来的smdk2410.o改成下面:
COBJS := tx2440.o flash.o
5. 进include/configs/, 把其他的都删掉, 只把smdk2140.h改名为tx2440.h
6. 把cpu/arm920t/config.mk里面-msoft-float注释掉
PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -ffixed-r8
# -msoft-float
7. 用make tx2440_config看看有否:
Configuring for tx2440 board...
8. 增加对sdram的支持, 确定board/tx2440/lowlevel_init.s内存映射如下:
#define B1_BWSCON (DW32)
#define B2_BWSCON (DW16)
#define B3_BWSCON (DW16 + WAIT + UBLB)
#define B4_BWSCON (DW16)
#define B5_BWSCON (DW16)
#define B6_BWSCON (DW32)
#define B7_BWSCON (DW32)
并修改REFCNT为0x4f4
#define REFCNT 0x4f4 /* period=15.6us, HCLK=60Mhz, (2048+1-15.6*60) */
9. 修改cpu/arm920t/s3c24X0/speed.c
增加一行:
DECLARE_GLOBAL_DATA_PTR;
增加红色的部分:
static ulong get_PLLCLK(int pllreg)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
ulong r, m, p, s;
if (pllreg == MPLL)
r = clk_power->MPLLCON;
else if (pllreg == UPLL)
r = clk_power->UPLLCON;
else
hang();
m = ((r & 0xFF000) >> 12) + 8;
p = ((r & 0x003F0) >> 4) + 2;
s = r & 0x3;
/* support both of S3C2410 and S3C2440 */
if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)
return((CONFIG_SYS_CLK_FREQ * m) / (p << s));
else
return((CONFIG_SYS_CLK_FREQ * m * 2) / (p << s)); /* S3C2440 */
// return((CONFIG_SYS_CLK_FREQ * m) / (p << s));
}
/* return FCLK frequency */
ulong get_FCLK(void)
{
return(get_PLLCLK(MPLL));
}
同时增加下面的:
/* for s3c2440 */
#define S3C2440_CLKDIVN_PDIVN (1<<0)
#define S3C2440_CLKDIVN_HDIVN_MASK (3<<1)
#define S3C2440_CLKDIVN_HDIVN_1 (0<<1)
#define S3C2440_CLKDIVN_HDIVN_2 (1<<1)
#define S3C2440_CLKDIVN_HDIVN_4_8 (2<<1)
#define S3C2440_CLKDIVN_HDIVN_3_6 (3<<1)
#define S3C2440_CLKDIVN_UCLK (1<<3)
#define S3C2440_CAMDIVN_CAMCLK_MASK (0xf<<0)
#define S3C2440_CAMDIVN_CAMCLK_SEL (1<<4)
#define S3C2440_CAMDIVN_HCLK3_HALF (1<<8)
#define S3C2440_CAMDIVN_HCLK4_HALF (1<<9)
#define S3C2440_CAMDIVN_DVSEN (1<<12)
/* return HCLK frequency */
ulong get_HCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
unsigned long clkdiv;
unsigned long camdiv;
int hdiv = 1;
/* support both of S3C2410 and S3C2440 */
if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)
return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());
else
{
clkdiv = clk_power->CLKDIVN;
camdiv = clk_power->CAMDIVN;
/* work out clock scalings */
switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
case S3C2440_CLKDIVN_HDIVN_1:
hdiv = 1;
break;
case S3C2440_CLKDIVN_HDIVN_2:
hdiv = 2;
break;
case S3C2440_CLKDIVN_HDIVN_4_8:
hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
break;
case S3C2440_CLKDIVN_HDIVN_3_6:
hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
break;
}
return get_FCLK() / hdiv;
}
}
/* return PCLK frequency */
ulong get_PCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
unsigned long clkdiv;
unsigned long camdiv;
int hdiv = 1;
/* support both of S3C2410 and S3C2440 */
if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)
return((clk_power->CLKDIVN & 0x1) ? get_HCLK()/2 : get_HCLK());
else
{
clkdiv = clk_power->CLKDIVN;
camdiv = clk_power->CAMDIVN;
/* work out clock scalings */
switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
case S3C2440_CLKDIVN_HDIVN_1:
hdiv = 1;
break;
case S3C2440_CLKDIVN_HDIVN_2:
hdiv = 2;
break;
case S3C2440_CLKDIVN_HDIVN_4_8:
hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
break;
case S3C2440_CLKDIVN_HDIVN_3_6:
hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
break;
}
return get_FCLK() / hdiv / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
}
}
下面的两个函数ulong get_HCLK(void);ulong get_PCLK(void); 删掉或者注释掉.
#if 0
/* return HCLK frequency */
ulong get_HCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());
}
/* return PCLK frequency */
ulong get_PCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
return((clk_power->CLKDIVN & 0x1) ? get_HCLK()/2 : get_HCLK());
}
#endif
10. 记得把整个目录拷贝到非共享目录下编译,不然会出现错误:
ln: creating symbolic link `asm' to `asm-arm': Operation not supported
然后make tx2440_config, 出现
Configuring for tx2440 board...
然后make all
出现这个错误:
speed.c:137: error: structure has no member named `CAMDIVN'
修改include/s3c24x0.h
在S3C24X0_CLOCK_POWER结构体内增加:
S3C24X0_REG32 CAMDIVN; /* for s3c2440*/
然后就可以make了, 奇怪的是, 只在/tmp里面能make....
生成了u-boot.bin文件, 拷贝到windows下面, 用easy openJtag烧录进去吧..
--------------------------
增加NandFlash的支持:
修改include/configs/tx2440.h
#define CONFIG_COMMANDS \
(CONFIG_CMD_DFL | \
CFG_CMD_CACHE | \
CFG_CMD_NAND | \
/*CFG_CMD_EEPROM |*/ \
/*CFG_CMD_I2C |*/ \
/*CFG_CMD_USB |*/ \
CFG_CMD_REGINFO | \
CFG_CMD_DATE | \
CFG_CMD_ELF)
把CFG_CMD_NAND加进去, 然后在文件尾部增加:
/*NAND flash settings*/
#define CFG_NAND_BASE 0 //无实际意义：基地址，在board_nand_init中重新定义
#define CFG_MAX_NAND_DEVICE 1 //NAND Flash设备数目为1
#define NAND_MAX_CHIPS 1 //每个NAND设备由1个NADN芯片组成
这个时候编译, 出现一个错误:
/tmp/u-boot-1.1.6/drivers/nand/nand.c:50: undefined reference to `board_nand_init'
make: *** [u-boot] Error 1
board_nand_init函数未定义
首先在include/s3c24x0.h增加结构体:
typedef struct {
S3C24X0_REG32 NFCONF;
S3C24X0_REG32 NFCONT;
S3C24X0_REG32 NFCMD;
S3C24X0_REG32 NFADDR;
S3C24X0_REG32 NFDATA;
S3C24X0_REG32 NFMECCD0;
S3C24X0_REG32 NFMECCD1;
S3C24X0_REG32 NFSECCD;
S3C24X0_REG32 NFSTAT;
S3C24X0_REG32 NFESTAT0;
S3C24X0_REG32 NFESTAT1;
S3C24X0_REG32 NFMECC0;
S3C24X0_REG32 NFMECC1;
S3C24X0_REG32 NFSECC;
S3C24X0_REG32 NFSBLK;
S3C24X0_REG32 NFEBLK;
} /*__attribute__((__packed__))*/ S3C2440_NAND;
在include/s3c2410.h里面增加函数声明:
static inline S3C2440_NAND * const S3C2440_GetBase_NAND(void)
{
return (S3C2440_NAND * const)S3C2410_NAND_BASE;
}
找到linux内核包, 把/drivers/mtd/nand/s3c2410.c 文件拷贝过来, 改名叫cpu/arm920t/s3c24x0/nand_flash.c
修改cpu/arm920t/s3c24x0/Makefile, 增加nand_flash.o
COBJS = i2c.o interrupts.o serial.o speed.o \
usb_ohci.o nand_flash.o
再编译make all